Cooking range with muffle-oven



Dec- 14, 19374 T. E. D. BILDE COOKING RANGE WITH MUFFLE OVEN Filed Nov. 16, 1933 2 Sheets-Sheet l mmmw ILL- mi Ill &,\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ T. E. D. BILDE COOKING RANGE WITH MUFFLE OVEN Dec. 14, 1937.

2 Sheets-Sheet 2 Filed Nov. 16, 1953 J70/mr 1J 567 PM .3 i a a 4 6 2 m 2 7 W f M Jl n/m O M 9 2 Al.. 5 9 l x MH 9 J. J m m85 2d n 8 Q m i e ,n v h l L IAn A: 1 n||||||n||||||||||u| 1| IIIHHHHHHVQ WI WIM 5 6 orng Patented Dec. 14, 1937 UNETED ST'ES FICE' Application November 16, 1933, Serial No. 698,338 in Sweden February Z3, 1933 1 Claim.

This invention relates to baking or like ovens adapted to be heated by gaseous, solid or liquid fuels and to devices for regulating the supply of gas to and of air from the said baking oven.

In accordance with one feature of the pre-sent invention the baking oven comprises a baking or like space constructed to be heated externally by the products of combustion of the fuel, means to prevent the entry of said combustion gases into the baking space and means for producing automatically a pre-determined circulation of heated air within said space.

The baking oven of the invention also includes a closed baln'ng space, a heating channel surrounding the baking space, and receiving hot combustion gases and an insulating jacket surrounding the heating channel.

Further features of the invention include the arrangement of a flue gas chamber located above the oven through which the products or combustion and if desired also the air and gases from` the oven itself must pass. The said arrangement providing also a thermally insulated space above the oven.

The invention will be hereinafter more particularly described with reference to the accompanying drawings, in which:-

Fig. l is a central vertical section of a gas stove with a baking oven in a plane at right angles to the frontplate.

Fig. 2 is a front elevation of the stove, the oven part being in section in a plane at right angles to Fig. l.

Fig. 3 is a cross sectional view of a ap valve.

Referring to the drawings, l denotes the top plate of the stove beneath which gas burners d3 are arranged in a space 2. The main casing of the stove is formed by a jacket or the like 3 of plate construction and said stove is carried by legs 4 constructed of angle iron which extend upwardly to the top plate i and form corner pieces for the jacket 3. Within the jacket 3 a baking oven 5e is located, formed mainly by a casing or the like l, around which two spaced jackets or the like 5 and 6 are arranged. The outermost jacket 5 is formed of sheet aluminium or the like and is adapted to serve as a heat reector and a heat insulator. The space between the jacket and the casing 'i is adapted to form a channel 52 for hot gases coming from a gas burner 20 disposed beneath the oven. Spacers or the like 24 are arranged in said channel 52 and in the space 53 between the jackets 5 and S heat insulating material such as crumpled aluminium foil or the like is provided. The oven. 54 has ALu'gs I5 are adapted to support a dish or the substantially vertical sides but the lower corners are rounded off and the base thereof inclines slightly downwards towards the centre. rihe top of the oven is bounded by a iiat or substantially flat plate or the like iii. On the outer side of v6 the muffle oven l and adjacent the gas burner 2E, a protecting plate or the like il of heat resisting material is provided.

Between the plate it and the upper part 26 oi' the munie oven l, a chamber 2i is formed which 10 is adapted to convey hot gases from the channel 52 andfrom the interior of the oven to a flue. The part t5 is provided with a number of holes '23 which may be arranged in any desired manner and adjacent the front of the stove said part 15 is cut away to form a slot or channel El which extends parallel to the front of said stove. The slot 5l forms a passage through which hot gases from the channel 52 may flow to the chamber 2i. Hot gases also flow from channel 52 to the .20 chamber 2! through the holes 23 but said holes offer more resistance to the gases than does the slot 5l.

The oven 54 is adapted to communicate with the channel 52 through a channel i2 formed 25 by a pipe Ii which is located near the front of the oven and extends between the plate lli and the part 2S. The channel I2 is controlled by a valve l. A flap valve fl (Fig. 3) may be provided which is adapted to pivot about an axis d2 and is provided with an element 4i against which a screw l2@ may abut to open the ap when the screw IZB-is moved relatively to the member |28 mounted on the door ISI.

The oven 5d is bounded at the rear by a wall 33. Spaced from said wall 33 to form a channel 6U for flue gases is a further wall 2i formed of sheet aluminium or the like andbeyond the wall 2l a further wall 28 is arranged, the space intermediate the walls 2l and 28 preferably being iilled with heat insulating material such as aluminium foil. Even if no heat insulating material is arranged in the space between the walls 2l and 23, a very good insulating eect is obtained.

The oven 5l! is provided with an inner com- 45 partment E85, in which the actual cooking of dishes for example of pastry takes place. This compartment 185, which is bounded by a base 9 and two side walls 8, is carried on supports 200 and is so constructed andarranged that channels 55 and 56 are formed between the edges of the base 9 and the front and rear of the oven respectively while channels 5B are formed between the walls S and the sides of said oven.

likeV in a suitable position, while brackets I6 are provided to form supports for .an upper shelf |81. Y The dishes toV be treated'are placedjn the inl ner compartment. |85 on Vthebase 9 Yor Yon the shelf |81.Y '.I'he'spac'e |86 beneath the' base Swill ,be strongly heated and the hot air will rise through the lchannels 58 in the direction of the Y A Y, arrows |38'to the upper part of the oven 54, where j it will .be cooled to'some extent and thence re-Y the chamber 2l and thence to the outlet |3. IfY Y Y turn are secured to plates I8.

turn to the space |86 Y throughV channels 55 and 56. Thus, a veryY good circulation ofY air within fthe oven isobtained.

The oven is heated by the burner 20, to Which gas or other fuel maybe supplied through a conduit 36 which on operation of a valve 59 communicates with a supply pipe 31 through a; conduit38.` Y Y Y' The burner 26 fis held in position by members` |9, which are mounted on members 35 which in n The outer jacket 5 and Vthe intermediate jacket 6 are rigidly secured to the members 35 andplates I8 respectively'. `VBeneath theV burner 29 a base plate 34 iis removably mounted.

The gas jets 43 for direct'heating areas abovementioned located in the space 2 beneath the 'top"|.= i

VThe operation Yof rthev oven is as follows: YOn initial heating the hot gases will rise through Ythe channel 52, throughtheslot 51 and holes 23 to the valve |'4 is closed the interior of theoven will be cut oi Vfrom'the outside air except in the case Y when theV door 3| is not tightly closed. Y There will; however, be a circulation of air within said Y 'oven as mentioned before since air will rise froml .the Vspace |85 through the openings 58to the Ytcp Y of the oven and on cooling will return to said Yspace,.|86 through theV channels 55 and 55. YOn

Y` opening the Valve |'4VY there will beV an `.upward draught Vthrough the oven and ther'above circulation of gases will be interrupted; The valve i4 should befregulatedaccording to the types of Y against which the screw |29 -facilitate regulation.

dishes being cooked, since some dishes require av much bigger Vdraughtthan do others. Y

The' baking oven may be of any suitable shap but the forrnrshown inIEigs.V l and 2 possesses many advantages. Y Y

When burning fuel otherthan gas for example, Wood, coal, coke, or the like, which needsra draught, it isadvisable to provide a valve such as that illustrated in Fig. 3, whichY Will'close automatically on opening the oven` door.v In the ar-V rangement shown'rin Fig. 3 the Valve 40 may be operated,V when Vthe door |3| is closed, by varying the position of theV screw |29. v the door |3| the screw |29 Will be brought outof contact with the part |4| and the Valve will automatically'assume a Vclosed position and thusr prevent'rany circulation of cool air through the chamber 2| and consequent cooling of the oven..Y

The part 4| may beY rounded off at the points I claimr- 'Y i In an oven construction arranged to give an equal heat in every part ofa Inutile oven, the combination of a closed shell, a mulejoven'suspended.` within said shell in such-a manner that channels abuts in order to On opening f for thehot flue gases are provided around the i walls of the mufiie oven, a heater arranged Within said shell and below said muiile oven, means to evenly distribute the heating medium overthe bottom and sidel walls and the upper side of the muiile oven and an inner food retaining compartment'suspended within said mulile Voven consistf ing of a, substantially horizontal plateY spacedY from the bottomcf themulile oven'and of suchV dimensionsrthat'channels are leftbetween itsV Y edges and the bounding walls of.' said muille oven,

saidy plate being provided With `two upwardly d1'- rected walls which extend throughout the depth ofthe oven and substantially parallel Vtothe sides .thereof toV form channels for air circulating Withinv said oven in a defined path' upwardly through Voppositely disposed side channels and down- `wardly. through further oppositely disposed end passages separated from saidV channelsbythe upwardly directed walls. Y' Y- TORD ERIK DANEL BILDE. 

